Manufacture of extensible slivers of artificial fibers



Feb. 18, 1941. w. ZETZSCHE ET'AL MANUFACTURE OF EXTENSIBLE SLIVERS 0F ARTIFICIAL FIBERS Filed March 14, 1939 2 Sheets-Sheet 1 l J l In ven tors Wal/her' Ze/zsche By771eir Afforny Franz Schiele kgmm Feb. 18, 1941. w. ZETZSCHE AEI'AL 2,232,299

MANUFACTURE OF EXTENSIBLRSLIVERS OF ARTIFICIAL FIBERS Filed March 14, 19159 2 Sheets-Sheet 2 lnvenfo rs v Wa/l'hrZeIzsche By Their- Aflorneys #19 Patented Feb. 18, 1941 MANUFACTURE or sx'rnusmns smvnns or ARTIFICIAL rnmns Walther Zetzsche and Franz Sehiele, Premnitz, Germany, assignors, by mesne assignments, to Walther H. Duisberg, New York, N. Y.

Application March 14, 1939, Serial No. 261,720 In Germany March 26, 1938 4 Claims.

Our present invention relates to the manufacture of extensible slivers of cut fiber from bands of continuous filaments.

A method of cutting continuous bands of artificial fibers has been proposed in which the fibers are brought together in the form of a sleeve and are advanced over a curved body forming a counter-support and the sleeve is cut 'by a circular knife which follows a line on the in curved body, the parallel positions of the fibers being maintained. Owing'to the rotation of the disc knife and the forward movement of the continuous bands along the curved body, the sleeve of fibers is out along a helical line. These sections of the bands of fibers are withdrawn in the band form by folding together without tension from the curved bo y so that there is a uniform overlap of the out fibers and an extensible sliver is produced.

Our inventionhas for an object to provide a 'device for producing fibrous bands having similar overlapping severed fibers.

Further objects of the present invention will appear from the following description. Reference is made to the accompanying drawings, in which: Figure 1 represents a front elevation of a device according to the invention,

Figures 2 and 4 are views representing details of the device shown in Figure 1, and

Figures 3 and 5 are side elevational views of devices according to the invention.

In Figure 1, the continuous bands I coming from spools or the like are delivered by rollers 2 positively driven by driving means capable of speed regulation to the cutter which is arranged obliquely, for example at an angle of 45 to the middle line of the continuous band. The continuous band I is conducted through av knifeedged slot 4 in a frame 3; beneath this knifeedged slot there is a sickle-shaped knife 6 mounted on a rotating shaft 5 and cooperation between the stationary slot knife 4 and this rotating knife 6 performs a shearing cut through the band. Instead of one sickle-knife, there may be several such, which are displaced with relation to each other. By using two cutting devices in the frame 3 which are arranged at an angle of .180 to each other, there is produced by the oblique arrangement of the knives in relation to the endless bands oblique cuts, one of which is a left hand cut and the other a right hand cut. If new the obliquely severed staple fibers which have left the two cutting devices are brought together by' means of guiding channels 9 (see Figure 4) at take-up rollers I so that the one covers the other, there is obtained a sliver in which the cut'ends of the fibers cross each other (see Figure 2), as is the case in the folding together of the helically cut sleeve described in 5 the U. S. patent application Ser. No. 244,426 filed December 7, 1938.

The advantage of the device is that the endless bands can be out very obliquely, which is useful for the subsequent drawing operation. 10 The length of the staple fibers may be adjusted as desired by adjustment of the speed of travel of the endless bands in relation to the number of rotations per minute and the number of the sickle-shaped knives. A checking of the fibers 15 by the severing cut of the band does not occur, since the sickle-shaped knife passes very rapidly and obliquely through the .band, By mounting four such cutting devices on the frame two slivers may be made which lie in two different planes. 2i)

The sliding speed of the fibers in the guiding channels 9 may be controlled by double rollers I, 8 positively driven by driving means capable of speed regulation (see Figure 5). The rollers 8 may also be used for keeping the bands taut 25 during the cutting (compare U. S; patent application Ser. No. 244,428 filed'DeceInber 7, 1938).

We claim: 1 1. A device for producing extensible sliversof cut fiber from bands of continuous filaments 30 comprising in combination a frame provided with a rotatable shaft and at least two knife-edged slots arranged obliquely to the middle line of the continuous band, a rotatable sickle-shaped knife mounted. on said shaft and arranged be- 35 neath said slots in such a manner that a shearing cut through said bands is obtained, rollers for guiding said bands towards said slots, guiding channels conveying the obliquely severed cut fibers from said cutters and bringing these fibers 40 I together; and take-up rollers arranged to receive said fibers in such a manner that the oblique lines of cut at the end of the cut fibers cross each other.

2. A device for producing extensible slivers of 45 cut fiber from bands of continuous filaments comprising in combination a frame provided with a rotatable shaft and at least two knifeedged slots, each of said slots being arranged at an angle of 45 to the middle line of the corresponding band, a rotatable sickle-shaped knife mounted on said shaft and arrangedbeneath said slots in such a manner that a shearing cut through said bands is obtained,. rollers for guiding said bands towards said slots, guiding chanw nels conveying the obliquely severed cut fibers from said cutters and bringing these fibers together, and take-up rollers arranged to receive said fibers in such a manner that the oblique lines of cut at the end of the cut fibers cross each other.

3. A device for producing extensible slivers of cut fibers from bands of continuous filaments comprising in combination a frame provided with a rotatable shaft and at least two knifeedged slots arranged obliquely to the middle line of the continuous band, a rotatable-sickle-shaped knife mounted on said shaft and arranged beneath said slots in such a manner that a shearing cut through said bands is obtained, rollers for guiding said bands towards said slots, guiding channels conveying the obliquely severed cut fibers from said cutters and bringing these fibers together, and take-up rollers arranged to receive said fibers in such a manner that the oblique lines of out at the end of the cut fibers cross each other, and rollers for controlling the sliding speed of said fibers in said guiding channels.

4. A device for producing extensible slivers of cut fibers from bands of continuous filaments comprising in combination a frame provided with a rotatable shaft and at least two lmife-edged slots; each of said slots being arranged at an angle of 45 to the middle line of the corresponding band, a rotatable sickle-shaped knife mounted on said shaft and arranged beneath said slots in such a manner that a shearing cut through said'bands is obtained, rollers for guiding said bands towards saidv slots, guiding channels conveying the obliquely severed cut fibers from said cutters and bringing these fibers together, and take-up rollers arranged to receive said fibers in such a manner that the oblique lines of cut at the end of the cut fibers cross each other, and rollers for controlling the sliding speed of said fibers in said guiding channels.

WALTHER. ZETZSCHE.

FRANZ SCHIELE. 

